90Mustangfan

what would be better for a 351 the afr 185 or 165. Im probally going turbo right after so keep that in mind...and is 10.1 compression too much for a boosted application. is 9.1 compression just right for turbo?

randy78045

Im running afr 205s on my car... as far as power adders go, i understand that lower compression is better...

S351R13

185s are too small if you plan on using a power adder. 205's are what you should start with.

99saleen351r

AGREED!!!!

DARKON

all a turbo does is essentially up the CR compression ratio.

using 10:1 CR will only inc off boost performance

all you do when the higher CR motor is boosted is use LESS boost than a lower CR motor would

do the 10:1 you will prob be happier with low end and off boost driving

grabbem88

185's too small for a 351?....ok sure..

r.barn

I'm planning on 185's for my 351W, or even TwistedWedges, they'll be plenty of head for that engine.

when i put a blower on I'll just have some port work done to them
to help open up flow

S351R13

That is the same idea as opening up a set of GT40s for a 400 ci windsor. If you start small you can only go so far. Also consider the time and expense when removing and installing heads along with the down time. Pro porting and bench work isn't cheap. You'll have more in port work that just buying a set of 205's and they won't flow with a 205. Before making a purchase you should talk to a reputable shop that builds performance motors daily and handles all the work in house including head porting. A few good shops would be Bennett racing, Keith Kraft, or Pro Line Racing engines.

DARKON

i dont want to steal this thread ...

but how about a pair of mildly ported gt40p on a 351w? would those be too small. i am looking for 300-400 whp

r.barn

those would be a bit on the restrictive side, i think the P's had smaller
valves, if i remember right.

i would stick with at least one of these heads.


AFR165
Twisted Wedge
Edlebrock RPM